| 摘要 |
An aerofoil ( 35 ) for example a fan blade ( 26 ) comprises a leading edge ( 36 ), a trailing edge ( 38 ), a concave pressure surface extending ( 40 ) from the leading edge ( 36 ) to the trailing edge ( 38 ) and a convex suction surface ( 42 ) extending from the leading edge ( 36 ) to the trailing edge ( 38 ). The aerofoil ( 35 ) comprises a metal foam ( 50 ) arranged within a cavity defined by metal workpieces ( 52, 54 ). The metal foam ( 50 ) of the aerofoil ( 26 ) ideally has a density of less than 1g/cm<SUP>3</SUP>, is cheaper to manufacture and has improved fatigue behaviour and impact capability.
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